adjure (v.)
late 14c., "to bind by oath; to question under oath," from Latin adiurare "confirm by oath, add an oath, to swear to in addition," in Late Latin "to put (someone) to an oath," from ad- "to" (see ad-) + iurare "swear," from ius (genitive iuris) "law" (see jurist). Related: Adjured; adjuring.